Think I've found 8 repeat frames in 1080p.wmv
First clue was 180 frames between cue marks, instead of 172.
Became curious, so I took a closer look.
Next clue was seeing twice the same bubble on bull's neck (49595 & 49603).
Here's AviSynth code to illustrate:
c16mm = ffVideoSource("Song of the South 16mm 1080p.wmv")\
.crop(240,0,-240,0).spline16Resize(720,540)\
.showFrameNumber(scroll=true)
return merge(trim(c16mm,49585,49600), invert(trim(c16mm,49593,49608)))
Maybe my decoder is buggy?
------ edit -------
More info for anybody who might like to try this at home:
If the first frame is called "00000",
cue marks appear at 49422-49425 then again 49606-609.
Do the math, that's 180 clear frames between the two cues.
Frames 49597-49604 look to be repeats of 49589-596 respectively.